Source region magnetic field of STEREO CMEs

Yan Li, Benjamin Lynch, Janet LuhmannSSL UC Berkeley

The Magnetic Cloud of Dec. 14-15, 2006 at ACE and STEREO IMPACT A Li, Lynch and Luhmann

SSL UC Berkeley

MC

• ACE at L1 Observed the ICME at ~900km/s.

• Left: T, Np, Vx, Dyn, Br,t,n, |B|.

• The ICME shock arrived at ~1400UT, and MC ~2300UT.• STEREO IMPACT(A) IMF (Red) are overplotted on ACE data (Black). The ICME has a ~25min delayed at IMPACT, but features are otherwise almost identical.

~900km/s

SOHO LASCO Halo CME on 2006/12/13 02:54:04 UT

Li, Lynch and LuhmannSSL UC Berkeley

1774 km/s (CME catalog, Yashiro et al.)

Dec-13-2006 flare and CME

1774 km/s

Yashiro et al.

The Active region (AR10930) observed in multi-wavelength

PhotosphereMagnetic Field

AR10930

Chromosphere Magnetic Field

AR10930

AR magnetc field andEvolution (MDI 96min)Dec 09 to 13, 2006

EruptionTime

Dec 13 2006 flare (HINODE SOT)

Left: Global solar magnetic field (MDI) for Dec. 13, 2006.The large active region (AR)10930 is the source regionof the CME.

PFSS model based on MDI synoptic map.Above: coronal holes and streamer arcade.Right: 3D streamer arcade on magnetogram

with center view of AR10930.(Blue: + Red: - )

Li, Lynch and LuhmannSSL UC Berkeley

AR10930

Above: 3D streamer arcade and AR10930. Top-right: Field arcades from photosphere to source surface over the erupting neutral line. No magnetic null point found at this resolution, but finer scale will be analyzed.Bottom-right: Near surface field arcades over the erupting neutral line.

Li, Lynch and LuhmannSSL UC Berkeley

The Magnetic Cloud of Dec. 14-15, 2006 at ACE and STEREO IMPACT A

• STEREO IMPACT(A) IMF (Red) are overplotted on ACE data (Black).

•The dashed lines mark the leading and trailing boundaries of the Magnetic Cloud.

•The MC fluxrope orientation (see Ying Liu et al.) agrees better with the overlying streamer belt, and nearly orthogonal with the erupting neutral line and post-flare arcade.

Li, Lynch and LuhmannSSL UC Berkeley

MC

CME May-19-2007 13:24UT 958km/s (LASCO CME catalog, Yashiro et al.)

C2 difference images C3 difference images

The eruption on May-19-2007 wavelet enhanced STEREO EUVI

anaglyph movies by Dr. Guillermo Stenborg

Yashiro et al.

958km/s

The Active region (AR10956) observed in multi-wavelength

PhotosphereMagnetic Field

AR10956

Chromosphere Magnetic Field

AR10956

Erupting Filament19-May-2007(BBSO Hαnetwork)

After the Eruption20-May-2007(BBSO Hαnetwork)

AR10956 inSoft X-Ray(HINODE)before the eruption

AR10956 inSoft X-Ray(HINODE)after theeruption

Trace and others?AR10956 In EUV171(TRACE Mosaic)May 19 00:09 UT

Trace and others?AR10956 In EUV171(TRACE Mosaic)May 21 00:09 UT

AR magnetc field andEvolution (MDI 96min)May 17 to 21, 2007

Eruption Time

May 17 May 21

Vector magetic field (NSO SOLIS)on May 15 and 22

1000 G 600 G

MDI synoptic mapA proxy of the globalsolar magnetic field.White: + Black: -

Coronal magneticStructure by PFSS modelRed: coronal holes -;Orange and aqua lines: streamer belt;Purple: heliospheric current sheet;Green lines: equatorial field lines.Blue: coronal holes +

AR 10956

Summary plots and events page athttp://sprg.ssl.berkeley.edu/impact/

• http://sprg.ssl.berkeley.edu/impact/data_browser.html

STEREO-A IMPACT STEREO-B IMPACTMay 21 – May 23, 2007

Goals

• CME initiation• CME and ICME connection